A doctor who secretly filmed more than 1,000 patients and staff and their children in hospital toilets has been jailed for five years today.

Dr Lam Yeoh, also known as Robin, planted recording devices in watches, pens, and hearing aid boxes, to make mini-home movies with titles such as ‘teenager bum, and ‘'Exeter 10/3 mum-young blonde.'

From yesterday: 'Doctor spied on more than 1,000 hospital patients and staff'

His three year voyeurism crusade ended in April when a camera fell onto the floor at St Anthony's Hospital in Cheam and it had footage of him blue-tacking it to the wall.

The 62-year-old was recording both sound and images of people on the toilet.

The father-of-three pleaded guilty yesterday to seven voyeurism charges, six charges of making indecent images of children as young as five, and a single charge for possessing 12 still images of extreme animal pornography.

More than 1,000 victims have still not been identified. Some of them were filmed on trains, trams and in the street. Some were of consultations and some of interviews with patients.

Recorder MacKinnon said today that Yeoh had been guilty of "a sophisticated, planned and long running campaign of voyeurism in which he grossly abused his position of trust".

He used video cameras and hidden cameras inside watches, pens, at hospitals across the country where he worked as an ear specialist.

Yeoh used hearing aid boxes and cameras hidden in watches to do his recording. He kept a record of each film using graphic descriptions, locations, days, months and, if he knew it, the victim's names.

Some of the individuals were collated into compilation footage.

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A woman health professional said in a statement: "I felt humiliated and violated when I found out I had been filmed using my workplace toilet - a place I thought would be safe and private.

"It’s led to me becoming anxious about my surroundings. Even when I was abroad on holiday in June, I was mindful of what had happened because I searched my hotel room and woke my boyfriend because I became suspicious of a ceiling smoke detector concerned it may have contained a camera.

"I feel my privacy and dignity have been abused by a doctor in a position of trust."

Anmother victim, who asked not be named, said: “I came to court to see him vulnerable, I wanted to get that power back.

"The effect he has had on me won’t just switch off. Trusting other people has become hard, and I always check toilets to make sure there are no cameras.

"In shopping centres the flushes have sensors which look like cameras, and they really freak me out now.

"I never liked working with him, he was a creep, socially awkard, and made really bad jokes.

"When there were parties coming up he would constantly encourage me to go. It was weird, it really was."

Speaking outside Croydon Crown Court after the sentencing, Detective Constable Aaron Moon, from Sutton CID, said: "Yeoh was very calculating. He organised situations so he could target people and engineer social events at his home address, and would pray on the vulnerable.

"Telling the victims has been a nightmare. We have had to tell them they have been a victim of a crime. 

"We have come into their lives, and turned their lives upside down."

Detective Inspector Sarah Rees, of Sutton CID, said: “With images of people filmed in consultations and in lavatories, his footage is truly appalling and has had a detrimental impact on everyone we have spoken to who has come into contact with him. 

"I believe Yeoh may be one of the most prolific, offenders of this nature, investigated by the MPS or any other police force in the country"

She asked anyone who believed they have been filmed to email the police at OperationSnowland@met.police.uk or call the police non-emergency number on 101.

Epsom and St Helier Hospital trust, which runs both hospitals said in a statement: "The Trust is appalled that Dr Yeoh chose to engage in such activity and we are very sorry to hear that his conduct has affected some of our patients and staff in this distressing incident."

It said he had been suspended in April and banned by the General Medical Council from practicing in the UK and then sacked on August 11. It said patients could call the Trust's dedicated helpline on 020 8018 4018 but said potential victims should contact the police.

Dr Yeoh is understood to have held clinics at St Helier in Sutton, but not at Epsom Hospital.

Recorder Warwick McKinnon sentenced Yeoh to five years in prison for making indecent images of children, with 3 years on extended licence.

He was sentenced to nine months for two counts of voyeurism, and 17 months for another four counts of voyeurism. Yeoh, of Garrats Lane, Banstead, will also serve nine months for possession of extreme pornography.

All the sentences will run concurrently so he will only serve a five year jail term.

The former world-renowned ear specialist will also spend the rest of his life on the sex offenders register and can only apply to be released when he has served two thirds of the sentence.